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156 lines
5.3 KiB
HTML
156 lines
5.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Compress a string</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.gzcompress" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gzcompress</h1>
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<p class="verinfo">(PHP 4 >= 4.0.1, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gzcompress</span> — <span class="dc-title">Compress a string</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.gzcompress-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>gzcompress</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$level</code><span class="initializer"> = -1</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$encoding</code><span class="initializer"> = ZLIB_ENCODING_DEFLATE</span></span>
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]] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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This function compresses the given string using the <em>ZLIB</em>
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data format.
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</p>
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<p class="para">
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For details on the ZLIB compression algorithm see the document
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"<a href="http://www.faqs.org/rfcs/rfc1950" class="link external">» ZLIB Compressed Data Format
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Specification version 3.3</a>" (RFC 1950).
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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This is <em class="emphasis">not</em> the same as gzip compression,
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which includes some header data. See <span class="function"><a href="gzencode.html" class="function">gzencode()</a></span>
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for gzip compression.
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gzcompress-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">data</code></dt>
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<dd>
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<p class="para">
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The data to compress.
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</p>
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</dd>
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<dt>
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<code class="parameter">level</code></dt>
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<dd>
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<p class="para">
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The level of compression. Can be given as 0 for no compression up to 9
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for maximum compression.
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</p>
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<p class="para">
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If -1 is used, the default compression of the zlib library is used which is 6.
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</p>
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</dd>
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<dt>
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<code class="parameter">encoding</code></dt>
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<dd>
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<p class="para">
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One of <strong><code>ZLIB_ENCODING_*</code></strong> constants.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.gzcompress-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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The compressed string or <strong><code>FALSE</code></strong> if an error occurred.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.gzcompress-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-869">
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<p><strong>Example #1 <span class="function"><strong>gzcompress()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$compressed </span><span style="color: #007700">= </span><span style="color: #0000BB">gzcompress</span><span style="color: #007700">(</span><span style="color: #DD0000">'Compress me'</span><span style="color: #007700">, </span><span style="color: #0000BB">9</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$compressed</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.gzcompress-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.4.0</td>
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<td>
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Added <code class="parameter">encoding</code> parameter.
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.gzcompress-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="gzdeflate.html" class="function" rel="rdfs-seeAlso">gzdeflate()</a> - Deflate a string</span></li>
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<li class="member"><span class="function"><a href="gzinflate.html" class="function" rel="rdfs-seeAlso">gzinflate()</a> - Inflate a deflated string</span></li>
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<li class="member"><span class="function"><a href="gzuncompress.html" class="function" rel="rdfs-seeAlso">gzuncompress()</a> - Uncompress a compressed string</span></li>
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<li class="member"><span class="function"><a href="gzencode.html" class="function" rel="rdfs-seeAlso">gzencode()</a> - Create a gzip compressed string</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |